import {
  document,
	window,
  HTMLCanvasElement,
  HTMLVideoElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
const vs = `

  uniform sampler2D map;

  uniform float width;
  uniform float height;
  uniform float nearClipping, farClipping;

  uniform float pointSize;
  uniform float zOffset;

  varying vec2 vUv;

  const float XtoZ = 1.11146; // tan( 1.0144686 / 2.0 ) * 2.0;
  const float YtoZ = 0.83359; // tan( 0.7898090 / 2.0 ) * 2.0;

  void main() {

    vUv = vec2( position.x / width, position.y / height );

    vec4 color = texture2D( map, vUv );
    float depth = ( color.r + color.g + color.b ) / 3.0;

    // Projection code by @kcmic

    float z = ( 1.0 - depth ) * (farClipping - nearClipping) + nearClipping;

    vec4 pos = vec4(
      ( position.x / width - 0.5 ) * z * XtoZ,
      ( position.y / height - 0.5 ) * z * YtoZ,
      - z + zOffset,
      1.0);

    gl_PointSize = pointSize;
    gl_Position = projectionMatrix * modelViewMatrix * pos;

  }
`
const fs = `

  uniform sampler2D map;

  varying vec2 vUv;

  void main() {

    vec4 color = texture2D( map, vUv );
    gl_FragColor = vec4( color.r, color.g, color.b, 0.2 );

  }
`
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {
var that = this
    let scene, camera, renderer;
    let geometry, mesh, material;
    let mouse, center;

    init();
    animate();

    function init() {

      const container = document.createElement( 'div' );
      document.body.appendChild( container );

      const info = document.createElement( 'div' );
      info.id = 'info';
      info.innerHTML = '<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - kinect';
      document.body.appendChild( info );

      camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10000 );
      camera.position.set( 0, 0, 500 );

      scene = new THREE.Scene();
      center = new THREE.Vector3();
      center.z = - 1000;
      const video = new HTMLVideoElement(that.selectComponent("#video"))
      //const video = document.getElementById( 'video' );

      const texture = new THREE.VideoTexture( video );
      texture.minFilter = THREE.NearestFilter;

      const width = 640, height = 480;
      const nearClipping = 850, farClipping = 4000;

      geometry = new THREE.BufferGeometry();

      const vertices = new Float32Array( width * height * 3 );

      for ( let i = 0, j = 0, l = vertices.length; i < l; i += 3, j ++ ) {

        vertices[ i ] = j % width;
        vertices[ i + 1 ] = Math.floor( j / width );

      }

      geometry.setAttribute( 'position', new THREE.BufferAttribute( vertices, 3 ) );

      material = new THREE.ShaderMaterial( {

        uniforms: {

          'map': { value: texture },
          'width': { value: width },
          'height': { value: height },
          'nearClipping': { value: nearClipping },
          'farClipping': { value: farClipping },

          'pointSize': { value: 2 },
          'zOffset': { value: 1000 }

        },
        vertexShader:vs,
        fragmentShader:fs,
        blending: THREE.AdditiveBlending,
        depthTest: false, depthWrite: false,
        transparent: true

      } );

      mesh = new THREE.Points( geometry, material );
      scene.add( mesh );

      const gui = new GUI();
      gui.add( material.uniforms.nearClipping, 'value', 1, 10000, 1.0 ).name( 'nearClipping' );
      gui.add( material.uniforms.farClipping, 'value', 1, 10000, 1.0 ).name( 'farClipping' );
      gui.add( material.uniforms.pointSize, 'value', 1, 10, 1.0 ).name( 'pointSize' );
      gui.add( material.uniforms.zOffset, 'value', 0, 4000, 1.0 ).name( 'zOffset' );

      video.play();

      //

      renderer = new THREE.WebGLRenderer();
      renderer.setPixelRatio( window.devicePixelRatio );
      renderer.setSize( window.innerWidth, window.innerHeight );
      container.appendChild( renderer.domElement );

      mouse = new THREE.Vector3( 0, 0, 1 );

      document.addEventListener( 'mousemove', onDocumentMouseMove );

      //

      window.addEventListener( 'resize', onWindowResize );

    }

    function onWindowResize() {

      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();

      renderer.setSize( window.innerWidth, window.innerHeight );

    }

    function onDocumentMouseMove( event ) {

      mouse.x = ( event.clientX - window.innerWidth / 2 ) * 8;
      mouse.y = ( event.clientY - window.innerHeight / 2 ) * 8;

    }

    function animate() {

      requestId = requestAnimationFrame( animate );

      render();

    }

    function render() {

      camera.position.x += ( mouse.x - camera.position.x ) * 0.05;
      camera.position.y += ( - mouse.y - camera.position.y ) * 0.05;
      camera.lookAt( center );

      renderer.render( scene, camera );

    }

  }
})